NM_001363.5:c.1255T>A

Variant names:

• chrX-154774701-T-A
• rs1557265435
• NM_001363.5:c.1255T>A

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_001363.5(DKC1):​c.1255T>A​(p.Tyr419Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: DKC1 NM_001363.5 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.60
• Publications: 0 publications found

Genes affected

DKC1 (HGNC:2890): (dyskerin pseudouridine synthase 1) This gene functions in two distinct complexes. It plays an active role in telomerase stabilization and maintenance, as well as recognition of snoRNAs containing H/ACA sequences which provides stability during biogenesis and assembly into H/ACA small nucleolar RNA ribonucleoproteins (snoRNPs). This gene is highly conserved and widely expressed, and may play additional roles in nucleo-cytoplasmic shuttling, DNA damage response, and cell adhesion. Mutations have been associated with X-linked dyskeratosis congenita. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2014]

DKC1 Gene-Disease associations (from GenCC):

• DKC1-related disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• dyskeratosis congenita, X-linked

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P
• dyskeratosis congenita

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Hoyeraal-Hreidarsson syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.897
• PP5: Variant X-154774701-T-A is Pathogenic according to our data. Variant chrX-154774701-T-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 434943.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001363.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DKC1	NM_001363.5	MANE Select	c.1255T>A	p.Tyr419Asn	missense	Exon 12 of 15	NP_001354.1
	DKC1	NM_001288747.2		c.1255T>A	p.Tyr419Asn	missense	Exon 12 of 14	NP_001275676.1
	DKC1	NR_110021.2		n.1834T>A		non_coding_transcript_exon	Exon 11 of 14

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DKC1	ENST00000369550.10	TSL:1 MANE Select	c.1255T>A	p.Tyr419Asn	missense	Exon 12 of 15	ENSP00000358563.5
	DKC1	ENST00000620277.4	TSL:1	n.1479T>A		non_coding_transcript_exon	Exon 12 of 14
	DKC1	ENST00000696628.1		c.1255T>A	p.Tyr419Asn	missense	Exon 12 of 15	ENSP00000512765.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dyskeratosis congenita, X-linked Pathogenic:1

Sep 13, 2016

Genetic Services Laboratory, University of Chicago

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.36
BayesDel_addAF	Pathogenic	0.55	D
BayesDel_noAF	Pathogenic	0.55
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.80	D
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.36	T
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Pathogenic	0.79	D
MutationAssessor	Pathogenic	3.0	M
PhyloP100		7.6
PrimateAI	Uncertain	0.60	T
PROVEAN	Pathogenic	-5.0	D
REVEL	Pathogenic	0.82
Sift	Uncertain	0.014	D
Sift4G	Uncertain	0.0020	D
Polyphen		0.94	P
Vest4		0.83
MutPred		0.30		Loss of phosphorylation at Y419 (P = 0.0059)
MVP		1.0
MPC		2.5
ClinPred		0.99	D
GERP RS		5.5
Varity_R		0.69
gMVP		0.90
Mutation Taster		=24/76	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1557265435; hg19: chrX-154002976;